642683678 has 72 divisors (see below), whose sum is σ = 1229505264. Its totient is φ = 246654720.

The previous prime is 642683663. The next prime is 642683681. The reversal of 642683678 is 876386246.

642683678 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8803850 + ... + 8803922.

It is an arithmetic number, because the mean of its divisors is an integer number (17076462).

Almost surely, 2^642683678 is an apocalyptic number.

642683678 is a deficient number, since it is larger than the sum of its proper divisors (586821586).

642683678 is a wasteful number, since it uses less digits than its factorization.

642683678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230 (or 156 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 50.

The square root of 642683678 is about 25351.2066379492. The cubic root of 642683678 is about 862.9767398121.

The spelling of 642683678 in words is "six hundred forty-two million, six hundred eighty-three thousand, six hundred seventy-eight".